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庞巴迪环球5000公务机机组操作手册 Bombardier Global-动力装置(20)

时间:2011-11-11 09:42来源:蓝天飞行翻译 作者:公务机 点击:
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GF1810_053
Flight Level Change mode transition to SPD Mode
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2

POWER PLANT
 
Airspeed Control Mode
The airspeed control mode is the basic control mode of the A/T. Engagement of the A/T system inflight while not in T/O or Retard mode, with no AP/FD mode engaged, will result in the A/T engaging in airspeed control mode. Airspeed control mode is also active if the A/T is engaged inflight with the AP/FD engaged in altitude capture (ASEL or VASEL), altitude hold (ALT or VALT) vertical speed (VS), VNAV vertical path (VPTH), pitch hold (PIT), or glideslope track (GS) modes.
The airspeed control mode tracks the active airspeed (IAS) or Mach target. The airspeed target is selected on the flight guidance panel and is modified by the FMS or manually.

SPD Knob
GF1810_054
The airspeed control mode provides high and low speed protection. In the event that the active speed target is above the structural limits (Vmo, Mmo, Gear and Flaps placards) minus 3 knots, the A/T will limit the speed to the lower of the appropriate limits, as a function of airplane configuration, minus 3 knots. The SPD active mode will revert to armed and LIM will become active.

Example: VMO Exceedence 266 Knots
GF1810_055
In the event that the active speed target is below the slow speed limit, the A/T will limit the speed to the slow speed limit to 1.2 Vs +3 knots when not in approach or 1.3Vs plus a wind gust compensation (max. 5 knots) when in approach. Approach is either gear down and Flaps >15° or GS mode engaged on AFCS.

Example: VMO Exceedence 124 Knots
GF1810_056
In the event that a speed target is selected that requires an engine EPR higher than the upper active EPR rating or lower than the active lower EPR rating, the A/T will limit the commanded thrust to the appropriate active EPR rating.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005 18.10.40 CSP 700.5000.6

POWER PLANT
 
Retard Mode
The retard mode control provides a fixed-rate thrust lever retard of both thrust levers to the idle position during airplane flare or landing. The A/T remains engaged until touchdown to provide go around thrust if go around mode is selected.
The retard mode activates based on a radio altitude of less than 50 feet AGL, if the airplane is in landing configuration (gear down and flaps ≥ 16°).
In the event that the airplane touches down without the A/T retarding the thrust levers, due to failing to detect a landing configuration or lack of valid radio altitude, the A/T will retard the thrust levers to idle upon touchdown detection.

Example: Flare and less than 50 feet Rad Alt. Example : Touchdown
Go Around Thrust Control Mode
The A/T go around mode provides a fixed rate thrust lever advance to the active upper EPR rating in response to the activation of the AP/FD go around mode.
 
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